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/**
* @file llmessagethrottle.cpp
* @brief LLMessageThrottle class used for throttling messages.
*
* $LicenseInfo:firstyear=2004&license=viewergpl$
*
* Copyright (c) 2004-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llhash.h"
#include "llmessagethrottle.h"
#include "llframetimer.h"
// This is used for the stl search_n function.
#if _MSC_VER >= 1500 // VC9 has a bug in search_n
struct eq_message_throttle_entry : public std::binary_function< LLMessageThrottleEntry, LLMessageThrottleEntry, bool >
{
bool operator()(const LLMessageThrottleEntry& a, const LLMessageThrottleEntry& b) const
{
return a.getHash() == b.getHash();
}
};
#else
bool eq_message_throttle_entry(LLMessageThrottleEntry a, LLMessageThrottleEntry b)
{ return a.getHash() == b.getHash(); }
#endif
const U64 SEC_TO_USEC = 1000000;
// How long (in microseconds) each type of message stays in its throttle list.
const U64 MAX_MESSAGE_AGE[MTC_EOF] =
{
10 * SEC_TO_USEC, // MTC_VIEWER_ALERT
10 * SEC_TO_USEC // MTC_AGENT_ALERT
};
LLMessageThrottle::LLMessageThrottle()
{
}
LLMessageThrottle::~LLMessageThrottle()
{
}
void LLMessageThrottle::pruneEntries()
{
// Go through each message category, and prune entries older than max age.
S32 cat;
for (cat = 0; cat < MTC_EOF; cat++)
{
message_list_t* message_list = &(mMessageList[cat]);
// Use a reverse iterator, since entries on the back will be the oldest.
message_list_reverse_iterator_t r_iterator = message_list->rbegin();
message_list_reverse_iterator_t r_last = message_list->rend();
// Look for the first entry younger than the maximum age.
F32 max_age = (F32)MAX_MESSAGE_AGE[cat];
BOOL found = FALSE;
while (r_iterator != r_last && !found)
{
if ( LLFrameTimer::getTotalTime() - (*r_iterator).getEntryTime() < max_age )
{
// We found a young enough entry.
found = TRUE;
// Did we find at least one entry to remove?
if (r_iterator != message_list->rbegin())
{
// Yes, remove it.
message_list->erase(r_iterator.base(), message_list->end());
}
}
else
{
r_iterator++;
}
}
// If we didn't find any entries young enough to keep, remove them all.
if (!found)
{
message_list->clear();
}
}
}
BOOL LLMessageThrottle::addViewerAlert(const LLUUID& to, const char* mesg)
{
message_list_t* message_list = &(mMessageList[MTC_VIEWER_ALERT]);
// Concatenate from,to,mesg into one string.
std::ostringstream full_mesg;
full_mesg << to << mesg;
// Create an entry for this message.
size_t hash = llhash<const char*> (full_mesg.str().c_str());
LLMessageThrottleEntry entry(hash, LLFrameTimer::getTotalTime());
// Check if this message is already in the list.
#if _MSC_VER >= 1500 // VC9 has a bug in search_n
// SJB: This *should* work but has not been tested yet *TODO: Test!
message_list_iterator_t found = std::find_if(message_list->begin(), message_list->end(),
std::bind2nd(eq_message_throttle_entry(), entry));
#else
message_list_iterator_t found = std::search_n(message_list->begin(), message_list->end(),
1, entry, eq_message_throttle_entry);
#endif
if (found == message_list->end())
{
// This message was not found. Add it to the list.
message_list->push_front(entry);
return TRUE;
}
else
{
// This message was already in the list.
return FALSE;
}
}
BOOL LLMessageThrottle::addAgentAlert(const LLUUID& agent, const LLUUID& task, const char* mesg)
{
message_list_t* message_list = &(mMessageList[MTC_AGENT_ALERT]);
// Concatenate from,to,mesg into one string.
std::ostringstream full_mesg;
full_mesg << agent << task << mesg;
// Create an entry for this message.
size_t hash = llhash<const char*> (full_mesg.str().c_str());
LLMessageThrottleEntry entry(hash, LLFrameTimer::getTotalTime());
// Check if this message is already in the list.
#if _MSC_VER >= 1500 // VC9 has a bug in search_n
// SJB: This *should* work but has not been tested yet *TODO: Test!
message_list_iterator_t found = std::find_if(message_list->begin(), message_list->end(),
std::bind2nd(eq_message_throttle_entry(), entry));
#else
message_list_iterator_t found = std::search_n(message_list->begin(), message_list->end(),
1, entry, eq_message_throttle_entry);
#endif
if (found == message_list->end())
{
// This message was not found. Add it to the list.
message_list->push_front(entry);
return TRUE;
}
else
{
// This message was already in the list.
return FALSE;
}
}
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